如何在 Java 9 中使用 Publisher-Subscriber 实现 Flow API?
javaobject oriented programmingprogramming更新于 2025/10/12 11:56:17
Flow API (java.util.concurrent.Flow) 已在 Java 9 中引入。它有助于理解 Publisher 和 Ssubscriber 接口交互以执行所需操作的不同方式。
Flow API 由 Publisher、Subscriber、Subscription 和 Processor 接口组成，这些接口可以基于反应流规范。
在下面的示例中，我们可以使用 Publisher-Subscriber 接口实现 Flow API。
示例
import java.util.concurrent.Flow.Publisher;
import java.util.concurrent.Flow.Subscriber;
import java.util.concurrent.Flow.Subscription;
public class FlowAPITest {
public static void main(String args[]) {
Publisher<Integer> publisherSync = new Publisher<Integer>() { // Create publisher
@Override
public void subscribe(Subscriber<? super Integer> subscriber) {
for(int i = 0; i < 10; i++) {
System.out.println(Thread.currentThread().getName() + " | Publishing = " + i);
subscriber.onNext(i);
}
subscriber.onComplete();
}
};
Subscriber<Integer> subscriberSync = new Subscriber<Integer>() { // Create subscriber
@Override
public void onSubscribe(Subscription subscription) {
}
@Override
public void onNext(Integer item) {
System.out.println(Thread.currentThread().getName() + " | Received = " + item);
try {
Thread.sleep(100);
} catch(InterruptedException e) {
e.printStackTrace();
}
}
@Override
public void onError(Throwable throwable) {
}
@Override
public void onComplete() {
}
};
publisherSync.subscribe(subscriberSync);
}
}
输出
main | Publishing = 0 main | Received = 0 main | Publishing = 1 main | Received = 1 main | Publishing = 2 main | Received = 2 main | Publishing = 3 main | Received = 3 main | Publishing = 4 main | Received = 4 main | Publishing = 5 main | Received = 5 main | Publishing = 6 main | Received = 6 main | Publishing = 7 main | Received = 7 main | Publishing = 8 main | Received = 8 main | Publishing = 9 main | Received = 9
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